The circuit is the same as the V7 VHF FM transmitter, but with a few small additions. TR1 (BC547) is an inverted Hartley oscillator which is based on the inductor manufactured PCBs. This makes it stable and megga-setable throughout the VHF FM band (76MHz to 119MHz) and the BB105 varicap voltage is tuneable over about 8MHz of that band. The inductor has one tapping for feedback and the second to feed an optional prescaler. TR2 is a buffer / amplifier and TR3 to PA phase. [...]

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Tags: High Quality fm transmitter, vhf transmitter

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